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Voltage Drop Table

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110 Volt, Single Phase, Max 3% Voltage Drop*
Length of Run
 
25'
50'
100'
150'
200'
 
Copper
14
12
8
6
6
15 AMP
Copper
12
10
8
6
4
20 AMP
Copper
10
8
6
4
3
30 AMP
Copper
3**
3**
1
2/0
3/0
100 AMP
Aluminum
2
2
2/0
4/0
300 MCM
100 AMP
Copper
3/0
3/0
3/0
250 MCM
350 MCM
200 AMP
Aluminum
4/0
4/0
300 MCM
400 MCM
600 MCM
200 AMP

 

220 Volt, Single Phase, Max 3% Voltage Drop*
Length of Run
 
25'
50'
100'
150'
200'
 
Copper
14
14
12
10
8
15 AMP
Copper
12
12
10
8
8
20 AMP
Copper
10
10
8
6
6
30 AMP
Aluminum
8
8
6
4
4
30 AMP
Copper
8
8
8
6
4
40 AMP
Aluminum
8
8
6
4
3
40 AMP
Copper
8***
8***
6
4
4
50 AMP
Aluminum
6
6
4
3
2
50 AMP

 

* The table above applies to the single phase systems, in steel conduit, at a conductor operating temperature of 75°C. It assumes a power factor of one. The table may be used for systems using non-steel conduit, but actual results for these conditions may result in a greater voltage drop.

** Type NMB cables may not be used for a 100 amp load.

*** Must use 6 gauge if using NMB or UFB.

 

WARNING! Installation of electrical wire can be hazardous, if done improperly, can result in personal injury or property damage. For safe wiring practices, consult the National Electrical Code® and your local building inspector.